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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da151b0a3df714c9fa72fd7c40a0b1349f1a2d753fe849cf229b9714cf57ab97' 
  AND token = 'MDsGUbmgvRWGD/+9UitkxBH/ZXtsPaHp8saGbcgEw4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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