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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64fdd02efc76824e91f75d6ef1e0012c468e9d60a4473f85ff1385d3ee2b91f7' 
  AND token = 'BAurW5q+MYCUao7PgyemT/nc2OOsEtXtDJEf6OElC24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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