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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '761cc99295019428cd3fb86e5376a21841fb7bf8bdef446458fa8f0c61fb45b8' 
  AND token = 'ALJ+rQ71ugiA/a8AD0CGBBfRqyJWG7DpbRSTbb5YSPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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