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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd83b5eba6678c7256b94d21340fe38a8eae20fbc10f9004f4e8e78e22e442e' 
  AND token = '8QsEo1i6ds5XSHKdEn4G/0hyaBEEevkwetekDNHgJiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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