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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6a94b1876c227d62b19ecb824a258651da5fda6f792e5b899aca89bc352bd04' 
  AND token = 'iUxvev+4SMegLjMhs/CMCfLY9rZSoY2X0PxoeJxKmfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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