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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e974e47802280a8a36c35b63831f17eab7ece81292ccb011dff63674f7c4b7f' 
  AND token = 'cCbhVFwySwa4zPBATPDGy8MNTCFdxZ27GMiWQAy22mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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