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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '876e47e69f197e0336db40f621c665c11e5e5ecc04611e47e3278065de31840c' 
  AND token = '7d4cXMZsb9dvnBj8wkjUIDISvzaXT98I7k1CuZPK7+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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