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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0763fc144b7ae50afc1d68460d2a2e9ff77108bea67d5c810fb0f646e9215e9' 
  AND token = 'Wm/inFdMbL7OzCZP6dT5FCTMFF9AL6QE9e9DFKEl2zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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