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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed9eaa8d4c7f882ba835ed404a9b3409442ccd09ecf8781a3676e571776c25b3' 
  AND token = '8rFhlnMCDIAqIEeSR+rOhc4cQTIY5B3r8tPmLJ+rfss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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