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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a25b2d724f0a7f6436a73ff46efede1e451ab2540ba30a7cc1d30d04ae55e2c7' 
  AND token = 'sjs9lreZ8jkPu8KwlaLe/fiytknP/czsEnqqpgPxVNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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