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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8894debc3ac987e814bd718588e48f0a69a68c385ad39e29aab610b9becdddd6' 
  AND token = 'Lk27+/LHo8RXyJLB8hksjrFqhuWD6YAu8P1cWP30j5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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