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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b416a3bc8d0f0cb1f9976d6686b0115099bec40c40689fa453b40bedc4015e' 
  AND token = 'RMS/oyDeGQqec0eC9X5tURQz2JVOSCJb9ekfuiXaOWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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