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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cae5c2d5559ad188f655d39df121a0b8c7cc0e721bbd9d2b3a47a8d4c89af3b' 
  AND token = 'EXZyyy35QapL8HDreQosMJWHMm7Huod4OStfwZY9wS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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