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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed2e0575da526d2773877e546da9539372f6a001a45d69e043c6a90606ce7c13' 
  AND token = '7fEWeq2WWOFvFDKU31KxYEbbkgubIvwIfqynjUHlnNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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