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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f60a75cde3e17b3067602d2deeda48e7b180c0ca371d95d09d99f1dd4772d03' 
  AND token = 'uL86CGMcEL69EzCSK1WQo1/UQm6LwQTeR3JXGwJRA4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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