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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a4e7d80c561aacefaa338aa94d01116261111923999282f589cc5ea8478fda5' 
  AND token = '7pgGR19OCKrM4f9A0FRTIijsNmebJQ6tmbwnX4WO9Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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