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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b0b959093c9b2afab1c9e583a7a20133da514f099ab4ecff1f33d83d9b9504c' 
  AND token = '+jQh1dH0jXJZjvC5aL7JPAbmkRrzp62TVIbqzHOy914=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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