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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c9bfbde055632dedb5a987104fee9f6608a235f098128f54feb2545d6e0fb5' 
  AND token = '8eL/8PbQ2BzC49AaJ3B08+OeHc+u2FpebL/gGqA13qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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