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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ab4517ffe8283828ce1f195af775ba150009869a2f4152b5a7b7e33de60775d' 
  AND token = '1iI+k64bQkcjJSpXswsY2IRhDnnhn/n3IjUzA96K17k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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