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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd46158fe1cde9bb650bd0c18730da12782408b93d1a3ed6a9a93e4c4977039be' 
  AND token = '64SdFkMwcoRfzcNablEIz+IRVDg6md+ZkyeOh54+CJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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