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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6f7ac4c3f87ff869d5e1b53eb23faf0c0fd6c86358426b9ac20320f2b651f9' 
  AND token = 'YFvp08dtkR02fFGXKcqol38Jo+3jWPEQ0UWjnz5W0zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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