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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba1732771b380c10576a6733f2aec264a5a85d1e151f24e95920715246f62d5' 
  AND token = 'yTTdqa+ragfUg4U5BPYYwWf66WC6lf5ZnWxEn/enWcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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