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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de29f0167e8ec6885e13b3fb6e1d7a5d8af878a0f8a9b05c49a23f172acd6a58' 
  AND token = 'xlCCSjGMI5c8IP0bR5KPsnS5VtjOZvnPbKplZKYdfjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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