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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a4767e36e5e65049f4a49c6558fb1c62e322c266b97faef61090400981cb008' 
  AND token = 'PbBKUe7wr5A1x4ZYUA9nbWnKg9jXjdJKx+jfVV0+9EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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