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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ded7c5d4b8ef372533f54d0fe0e282dc539343f64aa0b8d7589c849da1f53f' 
  AND token = '+QItDLuHbC3HFbnrzoJTH0TWANq1hts3GmRMFad0vDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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