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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b224d4f18e152846c6aefcffc7ff9c082c2926516462ed2aedd43d5714e636d0' 
  AND token = 'SP5UxWjUqSEhDGEN71IgyE4m15ogw6/pjZGQnuX82lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}