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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf58f5da230aa4f4e35372cf0f6aeb8c6341f7f500bb6e5ef13c4d1c6bbbbe4' 
  AND token = 'wNIhdeUXfCIFhQxtPfdaF9PqrMDr2iK8/ozkMA3cQ48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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