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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06aa05dae38a1bc0c1098710ccc7dc968db97823bd3d9b8110731cc8e8f39af1' 
  AND token = 'Mp3b8Sl6egfFm46wZ9EAkowN3LzgTt5Xsm9qk6WfH8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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