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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be64be914c1d78ce6ff06faf10fc75cf5beaaf48362ebe8c4990c51b5e5c13ea' 
  AND token = 'i5gtUV5bInOQxyvTsVmFmkIrMj0ks0iXZCi+ptrbd8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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