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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5df31509bd7edd20a8aa8ea4180537b7c899c776cea77a409828a9d8a2464c4a' 
  AND token = 'L6jM1r32L34BngQAu8GxhkXZR+MWEqvH3nsJQqGE1lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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