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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f1d59e3dd15b780661e3d5e9028ab56236c00f6c90cb996ca7b04b0f8db152' 
  AND token = '8P+TeU57YIbNvc0Oid2VnuQBvIW9gLzbnIWZNLwTomg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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