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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f97c0d4b7087e78b53f92186029c82fd3c753fdc5a4f3fff5893cca2047c9e' 
  AND token = 'RiCu6UuCQqKunGELChwev1jIiaWc+1ijQEFhgGAWgg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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