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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6cb6999b055bb2df6aa3ec64e5523b8bbc47edd87a814f4d319368960feabbb' 
  AND token = 'CjhlOTFQVmeIHeMNzCptDGmeTLa/GPQ0O7OkFThsQhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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