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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '298375658a97dc28d86b63b8d5c7fce6228638ae0dfb9a68b458b889e5165491' 
  AND token = 'RGNMzTT7c8rpQ7C5sRTMmTO0+E+5j9rVl5pkxi8H2TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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