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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aad796760126ef27ed79820e6948a544660cc70f02498d8d3ca0df486ee6895' 
  AND token = '0WGp4MB112HuqF/N0C2yDTnxiYnicXvvs/ygcns/V+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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