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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3f3705ecb38520d4bd717608bfef64e7f535e105ebaf636bab353dde1f0d26' 
  AND token = 'qULhhcD1wzye+ClKqC82mvctwx+ekQRJIXZjv/2W1iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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