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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c38fd52e5177285914c77b319d4f6414de93bfb39f973ef16933bdce7d9bf5' 
  AND token = '8TzXn2EVIIN/K6lYvVALs/ylWuENwqGoMPWrEtTbtNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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