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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc122d0230300a07c7c0f2f048c4ab8f4b8ea7417f8be2cb0586ccc7cced098' 
  AND token = 'N8ZMl41pZJgpmTlgu4xpN89v+AcJnjXnn/fBRWXUeCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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