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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0c57e25600147e8f16965e5ecbac74659d2e0648f6b20ca0660101433a69a4' 
  AND token = 'sKdNdRbVWQ1v1NQ0Xkjr3hLamUBRNVCeKaE725lSols=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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