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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c44460e0395fd7d7abb860833cbad7c4e6915502e5e26635b76fcfcf59ab9a09' 
  AND token = 'jzK6/ZgzL+p88IQOgmzQX5pXrckVTN6db6nfsEbb68A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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