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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438a82f8ab6ae2e443496d72865fbf468c3e053255d2c45ac7354d0019652b60' 
  AND token = 'z/lIHyMCb1l8KhoKpfwq6VKgD5aRcOAi50vvajMK3IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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