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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34bc1e06e25a87d08720314de6bc68a09ecb5169ee3cda55d81d86fcaa8a6c1c' 
  AND token = '4pBw6X3oU9764FerNnQDxJPPDUwO9Xe7piqw0N5lvxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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