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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07302c29be37aba91f94e88fe860aff9f48a36d060cb0b9400f02707bbd82aa' 
  AND token = 'frMXitTo7etcC9O444LCty/FzX/09K4gFBnzmjxgrjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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