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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f2c8ebfc0e82b683f66e273805bb08e508b5f8d32a991f9dd855310bbc0d95e' 
  AND token = 'MtBse6YYWfQkP/kZrheqJWZ28a8UPBbf+HwQL65QlYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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