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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa3c7deeac88c9fd1aabe8b8106e263846b813db5486dafbfdbb23ae393d1c2' 
  AND token = '3B+Pd5IGZ8tdW0Eg9oEf0trtjkDWT9YmXdy5KnGxkFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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