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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba90241d992e6c4ce99c8e300173a6221c88a0c1b9a4bba30506b08e1efb69d' 
  AND token = 'bP3r+GenLWUbsIq3f1uF8jHC4BVMIrazaX4DP7jgo8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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