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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5046509dbed32e73e00f5c4a788cd7e02f1de9a9419ca4c709e9f86608e75d40' 
  AND token = 'wSTAmaX7FclhraEU5mEPTOIDVfLu+/ZBecE4RjK58EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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