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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3431e4a47621407eb499315f6c569b830be761184392c655b80b01fd90522785' 
  AND token = 'BiXSQBUmtd9pMlgWxvuWxeBbA6cGREwosTxdS9ZI1zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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