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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fee93287dcdc0cec72bc1b4b285035a8b986083bc661f695c201bd402aa2a62' 
  AND token = 'A6Ud7ZOODJdE9ktDjDijUT94weC6/FIkwu6w+rWJc48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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