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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '667b5971be91e86187b57a403ede4c3b073329c4cd392321fa923d2a5e9116c0' 
  AND token = 'Rx2yuX8P6o8pNy+HMgwbbM6UgblVf9x0zKgvNst+l1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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