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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75a64f60cc3a84ad43ed15c1cc2fd03cac6e24ce50f2523deb7b877e4cd782a2' 
  AND token = 'RCURjoZzafHoKXcZloHAPITXsixbWn0IyjFh4fOnVfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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