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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f703d8dcb408efb433a07738fef4a75b3646717b1c8d1710537465bffde5d5c' 
  AND token = 'GH1U6FsL9LgoRGlK9jpptup7BInwTX0y3GJ5QcKiCyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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