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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4abc270ddd23357e91290581f939a01c85014a9f69b4b0b477e8af15f9e137c9' 
  AND token = '8mYQSyh4tohM+uBBccnMk/Us/+8SpEeRAsrEMhQe62w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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