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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6629b014c192ffc0e79547f0cb1b806ad7e3ff2be0efc817be5ecb0144e3728a' 
  AND token = 'sYCo34Jx6eOPj+lbdKKxQIiISb8tPbErlOTQECqGwN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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