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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b43906401b98f012d5624810d141df0cc24ca1a7c4468ba41d16f7b8809e4b' 
  AND token = '0kF5DImZmozQua9eceLZhMCIoUMSUUZ/vClCNxYAROU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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