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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd7cfd4db0dcf7bb521bc1dbd77b1b1d0079e59d4e178a01974f1daaf9d4df1' 
  AND token = 'KDNrE+HmmL27A7SKPvwF8kZcDMSX2jW7Q1k6kFrL5Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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