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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fad3207017fa18d0cd08d26dafdf2d7f3ba3c75319c381125571ea7f73b017a' 
  AND token = 'mw4nQnWd8lE/jQKu74h6FL1Dn+cJJiV5GCdA0kTAeDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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