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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2c07c6b67a68ecae5db0aed36a4eebdced6fe3d9a647f60624f99bcf54da22' 
  AND token = 'IBfc7oTRAvFUfFUNXdpbTSSQs9lDCQL7PMCoVI5x7B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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